JPS594271B2 - variable thrust drive device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a variable thrust and drive device that generates driving force, gear switching of a transmission, etc., when operating, controlling, and testing, for example, an automobile engine. .

When the switching means is driven by hydraulic pressure, pneumatic pressure, or an electric motor, it is necessary to apply extremely large driving force to move it at high speed.

By the way, hydraulic cylinders, rotary actuators, etc. can be stopped at any arbitrary position and can provide high thrust and high-speed motion, so they are used in engineering robots, transportation, and automatic equipment. However, this device weighs 50 kg/
d ~ 200 to 9/(-771) driven by a high pressure source,
Fine control of pressure and thrust is impossible. 10 The present invention aims to provide a device that controls pressures from several hundred points, eliminates accidents caused by high-speed motion, and performs motions similar to those operated by humans.

An example in which the present invention is applied to an automatic device for switching transmission gears in an automobile will be described below. In other words, this device is used as a kind of mouthpiece that simulates human movements to operate the transmission gear change. Humans first grasp the knob and then move it at a fairly high speed to the desired position.

If the load is abnormally heavy during the process, such as when the gears are misaligned, stop immediately, return to the original position, or move forward slightly, then release the knob at the specified position and operate. complete. In addition, the thrust generated by hydraulic pressure reaches several hundred kg, and the speed also reaches lm/sec2.
Easily rises to about 5. Therefore, in the event of some sort of failure, the shift lever will break. Even if an immediate stop is performed, an overrun of several tens of mm will occur. The present invention is aimed at taking these measures. n In Figures 1 and 2, 1 is a transmission case housing the engine transmission, and 2 is a shift lever 2a for changing gears.
A shift knob 3 provided on the shift knob 3 is a chuck that holds the shift knob 2, and is driven by an air cylinder 4.

Reference numeral 5 denotes an arm that supports the chuck 3 at 35 degrees.The movement of this arm 5 moves the knob, and as shown in FIG.

6 is a spline shaft that supports the arm 5; 7 is a rotary cylinder that rotates the spline shaft 6 as shown by an arrow 8; and 9 is a rotary type potentiometer that specifies the rotation angle of the arm 5, that is, the position of the shift knob 2.

10 is the mounting plate of arm 5. Linear bearing 12
supported by the arrow 13 by the hydraulic cylinder 11
The shift knob 2 is driven linearly as follows, and the shift knob 2 is driven accordingly.

14 is a linear potentiometer that detects the position of linear motion.

FIG. 4 shows a hydraulic circuit, in which the hydraulic rotary cylinder 7 and hydraulic cylinder 11 are driven by hydraulic pressure generated by a pump 17 driven by a motor 18, and are stopped and reversed by servo valves 15 and 16. etc. are controlled.

The solenoid valve 19 is normally closed, but in the event of an emergency stop, as will be described later, it opens to release oil and instantly lower the oil pressure. Figure 5 shows the operating state of the chuck section. When operating the shift knob 2, the chucks 3 and 3' are pushed by the air cylinder 4 to the position shown by the solid line, and when the operation is completed, they return to the position shown by the dotted line. do. FIG. 6 is a structural diagram of the chuck part. The air cylinder 4 has a bellow ram 21 inside, and the piston 23 is driven by the air flowing in through the air hole 222, and when the air pressure decreases, it is pulled back by the spring 24. It will be done.

A pressure sensor 20 is embedded in the tip of the piston 23 and detects the pressure applied to the chuck 3. The contact 25 is opened and closed by a cam plate 26 connected to the chuck 3 via a connecting rod 25'. That is, when the resistance force for moving the shift knob 2 is greater than the pressure set by the inflow air pressure, the piston rod 23 is pushed back, the cam 26 closes the contact 25, and an alarm is issued. FIG. 7 shows the air circuit, and the air supplied from the air supply pipe 27 is supplied to the pressure reducing valves 28 (28-A to 28-A).
28-D) to a predetermined pressure.

The pressure gauges 29 (29-A to 29-D) are for observing the set pressure. The set pneumatic pressure is set to 0n or 0ff by the solenoid valves 30 (30-A to 30-D), and it is determined which of A, B, C, and D is selected. The accumulator 31 requires a capacity that is sufficiently larger than the internal volume of the air cylinder, and the constant of the air spring is determined. The solenoid valve 32 controls the opening and closing of the chuck, and turns ON and OFF according to commands from the program. A plurality of pressure reducing valves 28 and solenoid valves 30 are installed, and the chuck pressure can be set depending on which solenoid valve is commanded, as shown in A, B, C, and D in the figure. If a servo valve that can change air pressure is used instead of the pressure reducing valve 28, a single solenoid valve combination will be used to control A, B, C,
There is no need for multiple numbers like D, . The operation of the apparatus configured as described above will be explained assuming that the apparatus is driven as an example without generating a thrust of 2k9 or more.

If the pressure receiving area of the air cylinder 4 is 5~, the pressure reducing valve 28
First, set it to 400y. Based on the programmed command signal, the solenoid valve 32 closes to form a circuit, then the solenoid valve 30 opens to supply air, the air fills the accumulator 31, and at the same time the air cylinder 4 operates to Complete the check on knob 2 in position. At this time, the force generated by the air cylinder is 4001 5 = 2k9. Next, in the case of the low gear position, the rotary cylinder 7 rotates to move the knob 2. At this time, if the gear is not engaged and receives a resistance of 2k9 or more, the chuck 3 and piston 23 are pushed back and the knob 2 is stopped at that position. Therefore, the cam plate 26 closes the contact 25,
The pressure sensor 20 and contacts 25 generate the current pressure and a stop signal. The stop signal operates the electromagnetic valve 19 of the hydraulic circuit to release the hydraulic pressure, the rotary cylinder 7 stops, and the arm 5 stops. Movement speed is 1m/
Sec, even if the solenoid valve operates with a delay of 10 msec, it will be about 1? The air cylinder is compressed. If the meshing of the gears becomes normal during this time, the resistance force will decrease, so the knob 2 will first be pushed by the piston 23 by air force,
Next, the contact 25 and the sensor 20 are deactivated, the electromagnetic valve 19 returns, and the hydraulic pressure is applied to restart the movement of the arm 5. The stopped position is constantly checked using a potentiometer, so it will stop when it reaches a predetermined position. If the programmed time exceeds the pressure sensor 20
When it feels pressure, it is possible to reverse the servo command and return it to its original neutral position. As described above, the present invention uses an air cylinder as an air spring, which also serves as a pressing force source for the shaft and chuck mechanism. This has the advantage of being able to prevent the driven body from being affected by the force, and also allows the driven body to be held with high precision.

In particular, when the present invention is applied to gear switching in a transmission, it is possible to approximate the gear switching action of a human being. In addition, since the configuration transmits the driving force to the driven object via an air cylinder, if the gears of the transmission malfunction, etc., a relative displacement between the arm and the piston will occur, and this relative displacement will be detected. It is also possible to stop the drive means.

[BRIEF DESCRIPTION OF THE DRAWINGS] FIG. 1 is a side view of a variable thrust drive device according to an embodiment of the present invention, FIG. 2 is a top view of the same, and FIG. 3 is a diagram showing a pattern of gear switching positions of a transmission. FIG. 4 is a diagram showing the hydraulic circuit, FIG. 5 is a diagram showing the operating state of the chuck portion, FIG. 6 is a structural diagram thereof, and FIG. 7 is a diagram showing the air circuit. 2...Shift knob, 3...Chuck, 4...Air cylinder, 7...Rotary cylinder, 11...
Hydraulic cylinder, 25...contact.

Claims (1)

[Claims] 1. A chuck that clamps a driven object, an air cylinder that controls opening and closing of this chuck at a constant pressure, and a driving means that supports the chuck and moves it in a predetermined direction.
comprising a position detection means for detecting that the driving means has reached a predetermined position, and a pressure detection means for detecting that the pressure applied to the chuck has reached a preset pressure,
A variable thrust drive device characterized in that movement of the drive means is stopped by an output of either the position detection means or the pressure detection means.